JPH10237771A - Modified acetate fiber fabric and production thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a fabric composed of a modified acetate fiber having ultra fine crimps, capable of preventing the weakening of the fiber to improve the tensile strength thereof, excellent in touch feeling with a smooth gross and a silky hand touch due to the fine crimps thereof, and having a sufficient strength for a use as a clothing, and to provide a method for producing the same fabric. SOLUTION: This modified acetate fiber fabric is obtained by performing an alkali-treatment of an acetate fiber fabric in a spread state in an aqueous solution containing an alkali compound for converting the surface of the acetate fiber to a cellulose, then enzyme-treating the cloth with a cellulose decomposing enzyme to decompose and remove the part made as the cellulose and then heating the cloth at >=96 deg.C under a wet heat for developing crimps in a fiber axis direction. The acetate fiber contained in the fabric has >=5000 crimps/m random crimps and >=0.5g/d tensile strength.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a modified acetate fiber woven fabric and a method for producing the same, and more particularly, to a modified acetate fiber woven fabric having fine crimps along a fiber axis direction and having a tensile strength of 0.5 g / d or more. The present invention relates to a modified acetate fiber woven fabric containing an acetate fiber and a method for producing the same.

[0002]

2. Description of the Related Art In recent years, in the field of textiles for clothing, various modifications and improvements have been made to various natural fibers and chemical fibers due to diversification of consumer needs and the trend of upgrading. Acetate fibers have also been improved in glossiness, texture, and quality by changing the fiber cross section, surface, and yarn morphology. Further, conventionally, in the case of cellulosic natural fibers, a method of reducing the weight by performing an enzymatic treatment with a cellulolytic enzyme to improve the smoothness and softness of the surface and improving the hygroscopicity is disclosed in JP-B-52-48236. And disclosed in Japanese Patent Application Laid-open No.

[0003] Unlike the natural and regenerated cellulose fibers, the hydroxyl groups of β-glucose are replaced by acetyl groups in the acetate fibers, so that it was impossible to reduce the weight by degrading with a cellulose-degrading enzyme (cellulase). The applicant has proposed in Japanese Patent Application Laid-Open No. Hei 5-27267 a method in which an acetate fiber is alkali-treated to convert the fiber surface layer into cellulose, and then the cellulose layer is decomposed and removed with cellulase to carry out an effective weight reduction process.

[0004] As a method of forming crimps in acetate fibers, a method in which twisting, heat setting, and untwisting are continuously performed by a high-speed false twisting spindle and a heater is mainly used. However, in the method by false twist, fiber strength is a limiting factor, and it is difficult to form fine crimps. As a method for expressing crimps other than the false twisting method, a method in which acetate long fiber yarns are pre-drawn in Japanese Patent Publication No. 47-37205 and then immersed in a swelling aqueous solution at an inclined angle to generate random crimps. Is disclosed. However, this method is also suitable as a method for obtaining a large crimp, but could not form a fine crimp.

[0005] The applicant of the present invention disclosed in Japanese Patent Application Laid-Open No. 6-184949, in which cellulose acetate surfaces were converted to cellulose with an alkali compound, and then the cellulose layer was decomposed and removed by cellulase treatment, followed by wet heat treatment. The present applicant has proposed a method of developing fine crimps. Further, the present applicant has disclosed in Japanese Patent Application Laid-Open No. Hei 7-82668 that a quaternary ammonium salt is added to an alkali compound when cellulose acetate fiber surface is converted to cellulose. Thus, a technique is disclosed in which the enzymatic treatment time in the subsequent step can be significantly shortened, and fine crimping can be performed efficiently.

[0006]

SUMMARY OF THE INVENTION Even with the method described above,
Although it was possible to develop very fine crimps in the acetate fibers, it was further desired to prevent the acetate fibers of the weft from becoming brittle and to improve the strength of the woven fabric. An object of the present invention is a modified acetate fiber having an ultra-fine crimp, which improves the tensile strength by preventing embrittlement of the acetate fiber, and by the ultra-fine crimp,
It is an object of the present invention to provide a modified acetate fiber woven fabric having a smooth luster, a silky feel, an excellent texture, and a sufficient strength for clothing, and a method for producing the same.

[0007]

That is, the first aspect of the present invention is as follows.
The gist of the invention is that in a woven fabric composed of at least a weft yarn containing acetate fibers, the acetate fibers contained in the woven fabric have a random crimp of 5,000 / m or more along the fiber axis direction and a tensile strength of 0. It is a modified acetate fiber woven fabric characterized by being at least 0.5 g / d.

The term "acetate fiber" as used in the present invention refers to diacetate fiber having an acetylation degree of 45 to 59.5%. Further, as other fibers, fibers which can be mixed and are not embrittled by an enzyme treatment are desirable, and synthetic fibers such as polyester fibers, polyamide fibers and acrylic fibers are preferably used. In addition, the ratio of acetate fiber and other fiber is yarn strength,
It can be set arbitrarily in consideration of the fabric strength and the effect of modifying the acetate fiber.

The weft constituting the acetate fiber woven fabric referred to in the present invention may be any one of acetate fibers alone, a composite yarn composed of acetate fibers and other fibers, or a mixture of acetate fibers and other fibers woven at an arbitrary ratio. There is no particular limitation on the warp as long as it is not embrittled by the enzyme treatment. Further, in the acetate fiber cloth according to the present invention, in order to sufficiently exhibit the effect of modifying the acetate fiber, the higher the mixing ratio of the acetate fiber, the better, and preferably 50% or more.

The term "crimp" as used in the present invention means that a crimp formed along the fiber axis direction has a gap between adjacent peaks.
It is a unit. The number of formed crimps can be determined from a scanning electron micrograph.

The tensile strength of the acetate fiber constituting the fabric referred to in the present invention is determined by decomposing the woven fabric and separating the yarn.
It can be measured by a known method. In the case where the yarn is a composite yarn composed of acetate fiber and another fiber, the tensile strength can be measured in the same manner after separating only the acetate fiber from the yarn separated from the woven fabric. Further, in the present invention, if the tensile strength of the acetate fiber is less than 0.5 g / d, it is not preferable in maintaining the mechanical properties (strength, abrasion resistance, etc.) of the fabric.

A second gist of the present invention is that a woven fabric composed of at least a weft thread containing an acetate fiber is subjected to an alkali treatment in an expanded state with an aqueous solution containing an alkali compound to convert the surface of the acetate fiber into cellulose, By enzymatic treatment with a decomposing enzyme to decompose and remove the cellulosic part, and then heating under moist heat of 96 ° C. or more,
A method for producing a modified acetate fiber woven fabric, characterized in that crimps are developed in the fiber axis direction.

Further, by using an aqueous solution containing an alkali compound and a quaternary ammonium salt, it is possible to shorten the enzymatic treatment time to be subsequently performed and to efficiently develop crimp.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION In the present invention, it is necessary to convert the surface of an acetate fiber into cellulose. Thereafter, it is necessary to decompose and remove the cellulized portion by enzymatic treatment. In the present invention, after most of the cellulose layer on the surface of the acetate fiber is decomposed and removed by enzymatic treatment,
A crimp can be developed by performing a heat treatment under a moist heat of not less than ° C. Here, as a heating method for causing crimping, a method such as steam heating treatment or immersion treatment in hot water can be used. That is, in order to develop crimping, it is essential to heat in an atmosphere containing moisture, and in dry heating, crimping does not occur. Further, in the present invention, the heating temperature is also important, and if the temperature is less than 96 ° C., no crimping occurs. In particular, in order to develop a fine crimp, a method of immersing in hot water of 100 ° C. or more is preferable, and a heating time of 2 minutes or more is preferable.

The alkali compound referred to in the present invention includes alkali metal hydroxides such as caustic potash and caustic soda, alkaline earth metal hydroxides such as calcium hydroxide and magnesium hydroxide, and strong alkalis such as sodium hydrogen carbonate and soda ash. Conjugated salts of weak acids and the like can be mentioned.

The quaternary ammonium salts referred to in the present invention include DYK-1125, DXY-10N (manufactured by one company),
Mercerin PES, Mercerin PEL, Mercerin PE
F (manufactured by Meisei Chemical Co., Ltd.), Cathizole NS-11conc
(Takamatsu Oil & Fat Co., Ltd.), Neolate NCB (Nichika Chemical Co., Ltd.), Sylfine PE (Senka Co., Ltd.), and other cationic weight loss accelerators available under the trade names.

The spread state as referred to in the present invention means that neither the warp nor the weft of the woven fabric has a sharply bent portion. For example, in order to carry out an alkali treatment in this state, an acetate fiber woven fabric is required. After continuous dip nip (immersion, pressing) in an aqueous solution containing an alkali compound, a continuous steamer that can continuously move the woven fabric in a spread state,
It is also possible to treat the woven fabric in a roll form by using a Jigger dyeing machine, a beam dyeing machine, or the like with an aqueous solution containing an alkali compound, such as a continuous high-pressure steamer. However, when using a high-speed circulation liquid dyeing machine,
The woven fabric is in a rope state, and particularly, the degree of the sharp bending of the weft at an arbitrary portion is increased, which is not preferable.

In the present invention, the alkali treatment in the spread state is for suppressing excessive embrittlement of the acetate fiber, that is, when the acetate fiber is bent in an aqueous solution containing an alkali compound, This is based on the finding that, particularly, the bent portion of the acetate fiber swollen in the aqueous solution is mechanically damaged, so that the alkali compound penetrates into the fiber more than necessary and causes excessive embrittlement. It should be noted that a dyeing machine generally used at present has a structure in which a weft is bent at an acute angle compared to a warp due to its structure.

Preferred conditions for the alkali treatment of the present invention are as follows:
Depending on the degree of modification of the acetate fiber woven fabric, in the case of immersion treatment, alkali compounds 2 selected from the above
An aqueous solution containing 40% by weight (based on the weight of acetate fiber) is used as a treatment agent, and a treatment is performed for 5 to 120 minutes at a temperature of room temperature to 95 ° C. to convert the acetate fiber surface into cellulose.

In the case of continuous treatment using a continuous steamer or the like, the concentration of the aqueous solution of the alkali compound to be used is set in consideration of the amount of liquid pick-up in the dip nip step and the degree of modification of the acetate fiber. Subsequent heat treatment may be either dry heat or steaming.
The treatment is carried out at a temperature of 80 ° C. for 5 to 120 minutes to convert the surface of the acetate fiber into cellulose. Furthermore, the cloth impregnated with the aqueous solution of the same alkaline compound by the dip nip process is wound into a roll, sealed with a film or the like, and then aged at room temperature to 80 ° C. for 1 to 48 hours to convert the surface of the acetate fiber into cellulose. It is possible to

In the present invention, by adding 0.5 to 50 g / l of a quaternary ammonium salt in addition to the alkali compound, the enzymatic treatment in the subsequent step can be shortened and can be carried out efficiently.

By the above method, the surface of the acetate fiber can be converted to cellulose. Next, an enzymatic treatment is carried out with a cellulose-degrading enzyme. The cellulose-degrading enzyme used in the treatment of the present invention is a cellulase that hydrolyzes cellulose, and is derived from fungi such as Trichoderma and Aspergillus. -1
0 (Yakult), Meiselase (Meiji Seika),
It can be easily obtained as a cellulolytic enzyme preparation under trade names such as Cell Soft L and Cell Soft Plus L (manufactured by Novo).

The treatment with the cellulose-decomposing enzyme varies depending on the degree of saponification (cellulose formation), the degree of modification required, and the like. It is immersed in an aqueous solution of 1 to 50 g / l of a cellulose-decomposing enzyme (cellulase) at 65 ° C., and the treatment is preferably carried out for 10 to 240 minutes with stirring. By this enzyme treatment, the cellulose layer on the acetate fiber surface is decomposed and removed. The enzyme remaining on the fabric can be easily deactivated by heating, such as immersion in hot water of 80 ° C. or higher.

After the alkali treatment and the enzyme treatment, the above-mentioned wet heat treatment at 96 ° C. or more, preferably 1
By performing the hot water treatment at a temperature of 00 ° C. or more, the acetate fibers have a fine and random crimp of 5,000 / m or more, and the tensile strength of the acetate fibers is 0.5 g / m
d or more can be obtained.
Such fabrics have a smooth, silky sheen.

[0025]

The present invention will be specifically described below with reference to examples. Example 1 Five-sheet satin woven fabric composed of diacetate fibers having a degree of acetylation of 56.9% (warp: bright 75d / 21f, weft: 100d / 27f, warp density: 200 / inch, weft density: 87 / Inches) was scoured with a 6-layer continuous scouring machine and then dried. Next, the same scouring cloth is spread at a cloth speed of 40 m / min.
In a 2-dip 2-nip system, 100 g / l of a caustic soda solution was attached to the fabric at 74% by weight, pre-dried between far-infrared heaters, and then steamed at 100 ° C. for 4 minutes using a continuous steamer. The fabric was washed with normal-temperature clear water in an open soaper and then dried to obtain a woven fabric in which the fiber surface was converted to cellulose and the weight loss rate was 7.9%. Then, the treated cloth was treated with Cellsoft L (a cellulolytic enzyme preparation manufactured by Novo) 5
g / l, Bioassist MT (Norion surfactant manufactured by Morirokusha) 5 g / l, bath ratio 1:50, 53 ° C., pH
The enzyme was treated in an aqueous solution of 4.8 for 240 minutes, immediately washed with water, and then treated in hot water of 80 ° C. for 15 minutes to deactivate the enzyme. After drying, it was immersed in hot water at 100 ° C. for 10 minutes in a free state, and then dried. 8200 pieces / m
A woven fabric composed of acetate fibers having fine crimps corresponding to the above was obtained. Next, the warp and the weft of the acetate fiber having a fine crimp were separated, and the tensile strength was measured. As a result, the warp and the weft each had a 0.71 g / d, 0.
It was 69 g / d.

Example 2 The same scouring cloth as in Example 1 was spread in a spread state at a cloth speed of 40 m / min.
An aqueous solution containing 20 g / l of 00 g / l caustic soda solution and 20 g / l of mercerin PEF (manufactured by Meisei Chemical Co., Ltd.), which is a quaternary ammonium salt-based alkali weight loss promoter, was applied to the fabric for 7 hours.
8% by weight, wound up in a roll form, aged in a sealed polyethylene sheet at 30 ° C. for 24 hours, washed with clear water at room temperature in an open soaper, and dried. A fabric that is 2% is obtained. Next, the treated cloth was made to contain 5 g / l of Cellsoft L (cellulose degrading enzyme preparation manufactured by Novo) and 5 g / l of bioassist MT (nonionic surfactant manufactured by Moriroku), and a bath ratio of 1:
Enzyme treatment was performed in an aqueous solution at 50 and 53 ° C. and pH 4.8 for 45 minutes, immediately after washing with water, and then treated in hot water at 80 ° C. for 15 minutes to deactivate the enzyme. After drying, put in hot water at 100 ° C.
It was immersed in a free state for 0 minutes and then dried. By this treatment, a woven fabric composed of acetate fibers having a fine crimp equivalent to 8,400 pieces / m was obtained. Next, the warp and the weft of the acetate fiber having a fine crimp were separated, and the tensile strength was measured.
73 g / d and 0.68 g / d.

Example 3 The same scouring cloth as in Example 1 was used.
In a spread state using a jigger dyeing machine, an aqueous solution containing 8% by weight (based on the weight of fabric) of caustic soda is used as a treating agent, and 30 ° C.
Then, the temperature was raised at a rate of 2 ° C./min, an alkali treatment was performed at 80 ° C. for 60 minutes, and then washed with fresh water and dried in the same dyeing machine. By this treatment, the fiber surface was converted to cellulose, and a woven fabric having a weight loss rate of 8.3% was obtained. Then, the treated cloth was treated with Cellsoft L (cellulolytic enzyme preparation manufactured by Novo) at 5 g /
l, Bioassist MT (Norion surfactant manufactured by Morirokusha) 5 g / l, bath ratio 1:50, 53 ° C, pH 4.8
The mixture was treated with an enzyme for 240 minutes while stirring in an aqueous solution of the above, immediately washed with water, and then treated with hot water at 80 ° C. for 15 minutes to deactivate the enzyme. After drying, it was immersed in hot water at 100 ° C. for 10 minutes in a free state, and then dried. 8800 by this processing
A woven fabric composed of acetate fibers having fine crimps corresponding to pieces / m was obtained. Next, the warp and the weft of the acetate fiber having a fine crimp were separated, and the tensile strength was measured. As a result, the warp and the weft each had 0.72 g / weft.
d and 0.67 g / d.

Example 4 The same scouring cloth as in Example 1 was used.
An aqueous solution containing 2 g / l of mercerin PEF (manufactured by Meisei Chemical Co., Ltd.), which is a caustic soda of 8% by weight (based on the weight of the fabric) and a quaternary ammonium salt in a spread state using a jigger dyeing machine, is used as a treating agent. 30 ° C to 2 ° C /
The temperature was raised at a rate of 1 minute, an alkali treatment was performed at 55 ° C. for 30 minutes, and then washed with fresh water and dried in the same dyeing machine. By this treatment, the fiber surface is converted to cellulose, and the weight loss rate is 8.5.
% Fabric. Next, this treated cloth was used for cell soft L.
(Novo-produced cellulose-degrading enzyme preparation) 5 g / l, Bio-assist MT (Moriroku-based nonionic surfactant) 5 g / l
The enzyme treatment was carried out for 30 minutes while stirring in an aqueous solution having a bath ratio of 1:50, 53 ° C. and pH 4.8, and immediately after washing with water,
The enzyme was inactivated by treatment in hot water of 80 ° C. for 15 minutes.
After drying, it was immersed in hot water at 100 ° C. for 10 minutes in a free state, and then dried. By this treatment, a woven fabric composed of acetate fibers having a fine crimp equivalent to 9100 pieces / m was obtained. Next, the warp and the weft of the acetate fiber having a fine crimp were separated, and the tensile strength was measured. As a result, the warp and the weft were 0.74 g / d and 0.71 g, respectively.
/ D.

(Example 5) 200 t / h of a diacetate fiber having a degree of acetylation of 56.9% (bright 45d / 34f) and a drawn polyester long fiber yarn (semi dull 30d / 12f).
m as a warp and a weft as 56.9 acetylation degree
% Diacetate fiber (bright 100d / 27f) and polyester long fiber drawn yarn (semi-dal 100d / 72)
f) is a five-sheet satin woven fabric (a density of 20)
(0 bars / inch, weft density 87 bars / inch) and then dried. The scoured cloth, in a spread state using a jigger dyeing machine,
4.4% by weight (based on the weight of fabric) of caustic soda and mercerin P which is an alkali weight loss accelerator for quaternary ammonium salts
Using an aqueous solution containing 2 g / l of EF (manufactured by Meisei Chemical Co., Ltd.) as a treating agent, the temperature was raised at a rate of 2 ° C./min from 30 ° C.
After alkali treatment for 1 minute, the plate was washed with fresh water and dried in the same dyeing machine. By this treatment, the fiber surface was converted to cellulose, and a woven fabric having a weight loss rate of 4.6% was obtained. Next, the treated cloth was made to contain 5 g / l of Cellsoft L (a cellulolytic enzyme preparation manufactured by Novo) and 5 g / l of Bioassist MT (a nonionic surfactant manufactured by Moriroku), and that a bath ratio of 1:50, 53 ° C.,
Enzyme treatment was performed for 30 minutes while stirring in an aqueous solution of pH 4.8, immediately after washing with water, and then treated in hot water of 80 ° C. for 15 minutes to inactivate the enzyme. After drying, put in hot water at 100 ° C.
It was immersed in a free state for 0 minutes and then dried. By this treatment, a woven fabric containing acetate fibers having a fine crimp equivalent to 8600 pieces / m was obtained. Next, the warp and the weft of the acetate fiber having a fine crimp were separated from the woven fabric, and the tensile strength was measured. As a result, the warp and the weft were 0.75 g / d and 0.72 g / d, respectively. .

Comparative Example 1 The same scouring cloth as in Example 1 was used.
Using a liquid dyeing machine, an aqueous solution containing 8% by weight (based on the weight of fabric) of caustic soda is used as a treating agent, the temperature is raised from 30 ° C at a rate of 2 ° C / min, alkali treatment is performed at 80 ° C for 60 minutes, and then the same dyeing is performed. After washing with fresh water in the machine, it was dried. By this treatment, the fiber surface was converted to cellulose, and a woven fabric having a weight loss rate of 8.3% was obtained. In the alkaline treatment step, the weft of the woven fabric was circulated in the dyeing machine at a speed of 350 m / min while moving in a rope state in which it was bent sharply at a plurality of locations and the bending position was also moving. Next, this treated cloth was made to contain 5 g / l of Cellsoft L (a cellulolytic enzyme preparation manufactured by Novo) and 5 g / l of Bio-Assist MT (a nonionic surfactant manufactured by Moriroku), and a bath ratio of 1:50, 53 ° C., and pH4. Enzyme treatment for 240 minutes with stirring in an aqueous solution of 0.8, and immediately after washing with water,
The enzyme was inactivated by treating in hot water of 15 ° C. for 15 minutes. After drying, it was immersed in hot water at 100 ° C. for 10 minutes in a free state, and then dried. By this treatment, a woven fabric composed of acetate fibers having a fine crimp equivalent to 8,100 yarns / m was obtained. Next, the warp and the weft of the acetate fiber having a fine crimp were separated, and the tensile strength was measured. As a result, the warp and the weft were 0.55 g / d and 0.16 g / d, respectively.
Met.

Comparative Example 2 The same scouring cloth as in Example 1 was used.
Using a jet dyeing machine, an aqueous solution containing 2 g / l of 8% by weight (based on the weight of fabric) of caustic soda and mercerin PEF (manufactured by Meisei Chemical Co., Ltd.), which is a quaternary ammonium salt, an alkali weight loss accelerator, is treated as a treating agent. The temperature was raised at a rate of 2 ° C./min from the temperature of 60 ° C., alkali treatment was carried out at 55 ° C. for 30 minutes, then washed with fresh water and dried in the same dyeing machine. By this treatment, the fiber surface was converted to cellulose, and a woven fabric having a weight loss rate of 8.4% was obtained. In the alkaline treatment step, the weft of the woven fabric was circulated in the dyeing machine at a speed of 350 m / min while moving in a rope state in which it was bent sharply at a plurality of locations and the bending position was also moving. Then, the treated cloth was treated with Cellsoft L (cellulose degrading enzyme preparation manufactured by Novo) at 5 g / l, Bioassist MT.
(Nonionic surfactant manufactured by Morirokusha) Enzyme treatment for 30 minutes while stirring in an aqueous solution containing 5 g / l in a bath ratio of 1:50, 53 ° C. and pH 4.8, immediately wash with water, and then heat at 80 ° C. The enzyme was inactivated by treatment in water for 15 minutes. After drying, 10
It was immersed in hot water at 0 ° C. for 10 minutes in a free state, and then dried. By this treatment, a woven fabric composed of acetate fibers having a fine crimp equivalent to 8,400 pieces / m was obtained. Next, the warp and the weft of the acetate fiber having a fine crimp were separated, and the tensile strength was measured. As a result, the warp and the weft were 0.55 g / d and 0.19 g / d, respectively.

Comparative Example 3 The same scouring cloth used in Example 1 was subjected to an alkali treatment and an enzyme treatment under the same conditions as in Example 1. The obtained treated cloth was heated at 120 ° C. for 30 minutes under dry heat, but no crimp occurred in this cloth.

Comparative Example 4 The same scouring cloth used in Example 1 was subjected to an alkali treatment and an enzyme treatment under the same conditions as in Example 1. The obtained treated cloth was heated at 95 ° C. for 30 minutes in hot water, but the fabric was hardly crimped.

[0034]

The modified acetate fiber woven fabric of the present invention is a unique fabric having a fine crimp, and is capable of effectively modifying a design surface and a texture surface by crimping. The crimped acetate fiber has a tensile strength of 0.5 g / d or more and good mechanical properties. In addition, the crimp of the acetate fiber of the present invention is random and very fine at a rate of 5,000 / m or more along the fiber axis direction. Further, the method for producing a modified acetate fiber woven fabric of the present invention can prevent the acetate fibers from being embrittled and improve the tensile strength without requiring a special device for developing crimp. Further, by adding the quaternary ammonium salt during the alkali treatment, the enzyme treatment time can be significantly reduced, and thus the fabric can be obtained with high productivity.

Claims (4)

[Claims] 1. A woven fabric comprising a weft containing at least acetate fibers, wherein the acetate fibers contained in the woven fabric have a random crimp of 5,000 / m or more along the fiber axis direction and a tensile strength of at least 5,000 fibers / m. A modified acetate fiber woven fabric having a content of 0.5 g / d or more. 2. A fabric comprising at least a weft thread containing acetate fibers is subjected to an alkali treatment in an expanded state with an aqueous solution containing an alkali compound to convert the surface of the acetate fibers into cellulose, and then subjected to an enzyme treatment with a cellulolytic enzyme. A method for producing a modified acetate fiber woven fabric, comprising decomposing and removing the cellulosic portion by heating and then heating under a moist heat of 96 ° C. or more to develop crimps in the fiber axis direction. 3. The method for producing a modified acetate fiber woven fabric according to claim 2, wherein the aqueous solution for the alkali treatment is an aqueous solution containing a quaternary ammonium salt. 4. The method for producing a modified acetate fiber woven fabric according to claim 2, wherein the crimping is performed in hot water at 100 ° C. or higher.